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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e69d0f401d9941a10ab1362be76e9a02eb1bb070b2eddd4f9537e502ad15891' 
  AND token = '85YiDYaNO8tAM9NVuhSByebEjNE4nvO93coqxUD6TtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}